<template>
  <div>
    {{ message }}
    <button @click="handleClick">Change word</button>
  </div>
</template>

<script>
  export default{
    data () {
      return {
        message: 'Hello World.'
      }
    },
    methods: {
      handleClick() {
        this.message = 'Hello Vue.'
      }
    },
  }
</script>